src/logind-user-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23
  24 #include "logind.h"
  25 #include "logind-user.h"
  26 #include "dbus-common.h"
  27
  28 #define BUS_USER_INTERFACE \
  29         " <interface name=\"org.freedesktop.login1.User\">\n"           \
  30         "  <method name=\"Terminate\"/>\n"                              \
  31         "  <property name=\"UID\" type=\"u\" access=\"read\"/>\n"       \
  32         "  <property name=\"GID\" type=\"u\" access=\"read\"/>\n"       \
  33         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  34         "  <property name=\"RuntimePath\" type=\"s\" access=\"read\"/>\n" \
  35         "  <property name=\"Service\" type=\"s\" access=\"read\"/>\n"   \
  36         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  37         "  <property name=\"Display\" type=\"(so)\" access=\"read\"/>\n" \
  38         "  <property name=\"State\" type=\"s\" access=\"read\"/>\n"     \
  39         "  <property name=\"Sessions\" type=\"a(so)\" access=\"read\"/>\n" \
  40         " </interface>\n"                                               \
  41
  42 #define INTROSPECTION                                                   \
  43         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  44         "<node>\n"                                                      \
  45         BUS_USER_INTERFACE                                              \
  46         BUS_PROPERTIES_INTERFACE                                        \
  47         BUS_PEER_INTERFACE                                              \
  48         BUS_INTROSPECTABLE_INTERFACE                                    \
  49         "</node>\n"
  50
  51 #define INTERFACES_LIST                              \
  52         BUS_GENERIC_INTERFACES_LIST                  \
  53         "org.freedesktop.login1.User\0"
  54
  55 static int bus_user_append_display(DBusMessageIter *i, const char *property, void *data) {
  56         DBusMessageIter sub;
  57         User *u = data;
  58         const char *id, *path;
  59         char *p = NULL;
  60
  61         assert(i);
  62         assert(property);
  63         assert(u);
  64
  65         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  66                 return -ENOMEM;
  67
  68         if (u->display) {
  69                 id = u->display->id;
  70                 path = p = session_bus_path(u->display);
  71
  72                 if (!p)
  73                         return -ENOMEM;
  74         } else {
  75                 id = "";
  76                 path = "/";
  77         }
  78
  79         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
  80             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
  81                 free(p);
  82                 return -ENOMEM;
  83         }
  84
  85         free(p);
  86
  87         if (!dbus_message_iter_close_container(i, &sub))
  88                 return -ENOMEM;
  89
  90         return 0;
  91 }
  92
  93 static int bus_user_append_state(DBusMessageIter *i, const char *property, void *data) {
  94         User *u = data;
  95         const char *state;
  96
  97         assert(i);
  98         assert(property);
  99         assert(u);
 100
 101         state = user_state_to_string(user_get_state(u));
 102
 103         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
 104                 return -ENOMEM;
 105
 106         return 0;
 107 }
 108
 109 static int bus_user_append_sessions(DBusMessageIter *i, const char *property, void *data) {
 110         DBusMessageIter sub, sub2;
 111         User *u = data;
 112         Session *session;
 113
 114         assert(i);
 115         assert(property);
 116         assert(u);
 117
 118         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "so", &sub))
 119                 return -ENOMEM;
 120
 121         LIST_FOREACH(sessions_by_user, session, u->sessions) {
 122                 char *p;
 123
 124                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 125                         return -ENOMEM;
 126
 127                 p = session_bus_path(session);
 128                 if (!p)
 129                         return -ENOMEM;
 130
 131                 if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 132                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 133                         free(p);
 134                         return -ENOMEM;
 135                 }
 136
 137                 free(p);
 138
 139                 if (!dbus_message_iter_close_container(&sub, &sub2))
 140                         return -ENOMEM;
 141         }
 142
 143         if (!dbus_message_iter_close_container(i, &sub))
 144                 return -ENOMEM;
 145
 146         return 0;
 147 }
 148
 149 static int get_user_for_path(Manager *m, const char *path, User **_u) {
 150         User *u;
 151         unsigned long lu;
 152         int r;
 153
 154         assert(m);
 155         assert(path);
 156         assert(_u);
 157
 158         if (!startswith(path, "/org/freedesktop/login1/user/"))
 159                 return -EINVAL;
 160
 161         r = safe_atolu(path + 29, &lu);
 162         if (r < 0)
 163                 return r;
 164
 165         u = hashmap_get(m->users, ULONG_TO_PTR(lu));
 166         if (!u)
 167                 return -ENOENT;
 168
 169         *_u = u;
 170         return 0;
 171 }
 172
 173 static DBusHandlerResult user_message_dispatch(
 174                 User *u,
 175                 DBusConnection *connection,
 176                 DBusMessage *message) {
 177
 178         const BusProperty properties[] = {
 179                 { "org.freedesktop.login1.User", "UID",              bus_property_append_uid,    "u",     &u->uid         },
 180                 { "org.freedesktop.login1.User", "GID",              bus_property_append_gid,    "u",     &u->gid         },
 181                 { "org.freedesktop.login1.User", "Name",             bus_property_append_string, "s",     u->name         },
 182                 { "org.freedesktop.login1.User", "RuntimePath",      bus_property_append_string, "s",     u->runtime_path },
 183                 { "org.freedesktop.login1.User", "ControlGroupPath", bus_property_append_string, "s",     u->cgroup_path  },
 184                 { "org.freedesktop.login1.User", "Service",          bus_property_append_string, "s",     u->service      },
 185                 { "org.freedesktop.login1.User", "Display",          bus_user_append_display,    "(so)",  u               },
 186                 { "org.freedesktop.login1.User", "State",            bus_user_append_state,      "s",     u               },
 187                 { "org.freedesktop.login1.User", "Sessions",         bus_user_append_sessions,   "a(so)", u               },
 188                 { NULL, NULL, NULL, NULL, NULL }
 189         };
 190
 191         assert(u);
 192         assert(connection);
 193         assert(message);
 194
 195         return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 196 }
 197
 198 static DBusHandlerResult user_message_handler(
 199                 DBusConnection *connection,
 200                 DBusMessage *message,
 201                 void *userdata) {
 202
 203         Manager *m = userdata;
 204         User *u;
 205         int r;
 206
 207         r = get_user_for_path(m, dbus_message_get_path(message), &u);
 208         if (r < 0) {
 209
 210                 if (r == -ENOMEM)
 211                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 212
 213                 if (r == -ENOENT) {
 214                         DBusError e;
 215
 216                         dbus_error_init(&e);
 217                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown user");
 218                         return bus_send_error_reply(connection, message, &e, r);
 219                 }
 220
 221                 return bus_send_error_reply(connection, message, NULL, r);
 222         }
 223
 224         return user_message_dispatch(u, connection, message);
 225 }
 226
 227 const DBusObjectPathVTable bus_user_vtable = {
 228         .message_function = user_message_handler
 229 };
 230
 231 char *user_bus_path(User *u) {
 232         char *s;
 233
 234         assert(u);
 235
 236         if (asprintf(&s, "/org/freedesktop/login1/user/%llu", (unsigned long long) u->uid) < 0)
 237                 return NULL;
 238
 239         return s;
 240 }